LuciferYang commented on code in PR #50474:
URL: https://github.com/apache/spark/pull/50474#discussion_r2032758294
##########
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala:
##########
@@ -1014,39 +1014,44 @@ final class ShuffleBlockFetcherIterator(
// a SuccessFetchResult or a FailureFetchResult.
result = null
- case PushMergedLocalMetaFetchResult(
- shuffleId, shuffleMergeId, reduceId, bitmaps, localDirs) =>
- // Fetch push-merged-local shuffle block data as multiple shuffle
chunks
- val shuffleBlockId = ShuffleMergedBlockId(shuffleId,
shuffleMergeId, reduceId)
- try {
- val bufs: Seq[ManagedBuffer] =
blockManager.getLocalMergedBlockData(shuffleBlockId,
- localDirs)
- // Since the request for local block meta completed
successfully, numBlocksToFetch
- // is decremented.
- numBlocksToFetch -= 1
- // Update total number of blocks to fetch, reflecting the
multiple local shuffle
- // chunks.
- numBlocksToFetch += bufs.size
- bufs.zipWithIndex.foreach { case (buf, chunkId) =>
- buf.retain()
- val shuffleChunkId = ShuffleBlockChunkId(shuffleId,
shuffleMergeId, reduceId,
- chunkId)
- pushBasedFetchHelper.addChunk(shuffleChunkId, bitmaps(chunkId))
- results.put(SuccessFetchResult(shuffleChunkId,
SHUFFLE_PUSH_MAP_ID,
- pushBasedFetchHelper.localShuffleMergerBlockMgrId,
buf.size(), buf,
- isNetworkReqDone = false))
- }
- } catch {
- case e: Exception =>
- // If we see an exception with reading push-merged-local index
file, we fallback
- // to fetch the original blocks. We do not report block fetch
failure
- // and will continue with the remaining local block read.
- logWarning("Error occurred while reading push-merged-local
index, " +
- "prepare to fetch the original blocks", e)
- pushBasedFetchHelper.initiateFallbackFetchForPushMergedBlock(
- shuffleBlockId,
pushBasedFetchHelper.localShuffleMergerBlockMgrId)
+ case PushMergedLocalMetaFetchResult(
Review Comment:
@joan38 Thank you for your work. I will revisit this pr after the official
release of Apache Spark 4.0.
However, given that there is currently no clear plan to migrate to Scala 3,
could you summarize the benefits that this pr can bring? I would like to know
some more practical benefits.
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